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title: "Information required for a geological cross-section"
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# Information required for a geological cross-section

![Drilling profile for a double-U geothermal probe](/assets/img/samples/de_bohrprofil_erdwaerme_komplett.png)
![Heat extraction rate according to VDI 4640](/assets/img/samples/de_entzugsleistung_vdi4640_komplett.png)
![Entering the specific heat extraction rate per soil layer](/assets/img/screenshots/en_04_drill_site_01_details_hole_05.png)
![Input screen for heat extraction capacity with reference to VDI 4640](/assets/img/screenshots/de_drillsite_demo01_drill_log_part02.png)
![Location and layout of geothermal boreholes](/assets/img/samples/de_lage_komplett.png)

The data for the **geological section** is derived from the **boreholes at a drilling site** and their **stratigraphic profiles**.

This information is entered in the borehole master data under **Location / Coordinates** and in the **stratigraphic log** for the respective borehole.

The data is maintained as follows:

- **Borehole coordinates**: Each borehole requires valid geographical coordinates. These are used for the spatial arrangement in the section.
- **Elevation data**: Correct elevation values must be recorded for all boreholes. It is important that all data is entered using the same elevation reference system, e.g. NHN, as no automatic conversion takes place between different systems.
- **Stratigraphic index**: The geological strata are defined by depth intervals for each borehole and form the basis for the stratigraphic sequence in the section.
- **Automatic section line**: The position of the section line is determined automatically. The shortest connection between the boreholes furthest apart is used for this purpose.
- **Automatic stratum assignment**: The connection and representation of the strata between the boreholes is carried out automatically on the basis of the structured stratum description. Free-text entries are not taken into account here.

The geological cross-section schematically illustrates the subsurface distribution between several boreholes and combines their geological information in a single view.